Jawab ya ✌️(pakai cara juga☺️)

2(2x + 4) + 2(2x - 1) = 70
4x + 8 + 4x - 2 = 70
8x = 70 + 2 - 8
8x = 64
x = 8

panjang = 2.8 + 4 = 16 + 4 = 20
lebar = 2.8 - 1 = 16 - 1 = 15
luas = 20.15 = 300 cm kuadrat

Keliling persegi panjang = 2p + 2l

2p + 2l = 70
2(2x+4 cm) + 2(2x-1 cm) = 70
4x + 8 + 4x - 2 = 70
4x + 4x + 8 - 2 = 70
8x + 6 = 70
8x = 70 - 6
8x = 64
x = 64/8
x = 8

Luas = p × l
Luas = (2x+4) cm × (2x-1) cm
Luas = (2×8+4) cm × (2×8-1) cm
Luas = 20 cm × 15 cm
Luas = 300 cm²

Semoga membantu yaa!